Sheet feeding apparatus and image forming apparatus

A sheet feeding apparatus comprising:

• a feeding roller which feeds a sheet;
• a separation roller which is pressed against the feeding roller and rotates in a reverse direction to a direction of feeding by the feeding roller to separate sheets, fed by the sheet feeding roller, one by one;
• a feeding rotational shaft which rotatably supports the feeding roller and is transmitted a rotational driving force from a driving motor;
• and
• a vibration absorbing portion which includes an elastic member and absorbs vibrations of the feeding roller while transmitting the rotational driving force from the feeding rotational shaft to the feeding roller,
• wherein the elastic member is formed in a shape of a substantially circular plate, and the elastic member has a through-hole through which the feeding rotational shaft is passed, a first connected portion that is connected with a connect portion provided on the feeding roller and a second connected portion that is connected with a connect portion provided on the feeding rotational shaft, and
• the first connected portion is connected with the connect portion of the feeding roller by engaging a protrusion formed in a radial direction from a center of rotation of the feeding rotational shaft with a groove formed in the radial direction from the center of rotation of the feeding rotational shaft.

A sheet feeding apparatus comprising a feeding roller which feeds a sheet;

• a separation roller which is pressed against the feeding roller and rotates in a reverse direction to a direction of feeding by the feeding roller to separate sheets, fed by the sheet feeding roller, one by one;
• a feeding rotational shaft which rotatably supports the feeding roller and is transmitted a rotational driving force from a driving motor;
• and
• a vibration absorbing portion which includes an elastic member which is elastically transformable in a rotating direction of the feeding roller, a first dumping collar provided on the feeding rotational shaft and a second dumping collar provided on the feed roller, and
• wherein the elastic member is connected with each of the first dumping collar and the second dumping collar.

A sheet feeding apparatus, comprising:

• a feeding roller which feeds a sheet;
• a separation roller which is pressed against the feeding roller and rotates in a reverse direction to a direction of feeding by the feeding roller to separate sheets, fed by the sheet feeding apparatus, one by one;
• a feeding rotational shaft which rotatably supports the feeding roller and is transmitted a rotational driving force from a motor;
• and
• a vibration absorbing portion which has an elastic member made of rubber material which is connected with each of the feeding roller and the feeding rotational shaft, and transmits the rotational driving force from the feeding rotational shaft to the feeding roller through the rubber material of the vibration absorbing member,
• wherein the elastic member has a connected portion that is connected with a connect portion provided on the feeding roller and the connected portion is a groove formed in a radial direction from the center of rotation of the feeding rotational shaft to be engaged with a pin fixed to the feeding rotational shaft.